I love collecting older Apple gear. While I never had an iBook G4 back in the day (I had a 2006 MacBook as my first Apple laptop, but really wanted the 12" PowerBook G4 in 2004), I've always loved it. I purchased a pristine 12-inch iBook G4 example on eBay: 1.33GHz, 1.5GB RAM, upgraded to a 256GB SSD running OS X Tiger (though I wish it was running Panther).
These machines are so old that the default browsers don't support newer TLS versions so modern websites won't connect, and trusted root certificates may be outdated. At least with OS X Tiger there is a fork of Mozilla Firefox for PowerPC called TenFourFox that lets you browse modern sites on old Macs. Though it was discontinued in 2021.
